Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20938a78d5dc1c4…

MALICIOUS

PDF

70.4 KB Created: 2021-01-28 01:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e4a1010d4f30b7235fd8be1733c1666e SHA-1: d0563ea4546e00866a5009a054ae7759b5f30422 SHA-256: a20938a78d5dc1c46db6edfdc6afe02e197ba3cca2414b428957adf76fbca245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent URL being https://baarspo.ru/123. The document body, though heavily obfuscated, appears to be related to a poster, suggesting a lure to a malicious website rather than direct execution of a payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/123?utm_term=eyes+are+watching+ears+are+listening+poster PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fe79322156f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd27b5809be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fd94c8c933ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_6000ca7cecb31.pdfIn PDF document text
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/vadoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416791/normal_5ff65dbdabea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418365/normal_5fc73d7f26596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5ff76d6724ce9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_60072fef77e34.pdfIn PDF document text
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/ketesenasukib_talunerixarasux_zusimixaruxukuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_601073c735cba.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/godibejulisim.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/kepipatefa_nugun_wekumez_momudaxipamowaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5ff677d558fef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taluzeze.rf.gd/5432380452.pdfIn PDF document text
    • http://meralilenizo.epizy.com/fevunasi.pdfIn PDF document text
    • http://tupusivamiguta.rf.gd/bloody_roar_2_for_computer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 5348 bytes
SHA-256: 58f0dc2ecf08ad0e2b866684d83c0a83ad370d0383695d8d33da2a99475087cd
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10440 bytes
SHA-256: 616b1a6a46224aef9b0be9f6c0e253e070f7961a7088fa988428439edd78b4fe

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